Satellite Gravity Constraints on the Antarctic Moho and Its Potential Isostatic Adjustments
Abstract We investigate the impact of combining Gravity Field and Steady‐state Ocean Circulation Explorer (GOCE) satellite gravity anomaly and Bedmap2 terrain relief data to enhance Antarctic seismic Moho estimates over the satellite's coverage region south of latitude 60°S. The study considers...
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ftdoajarticles:oai:doaj.org/article:9498baf2646245a5aaf6b296dc1699cc 2023-12-03T10:11:22+01:00 Satellite Gravity Constraints on the Antarctic Moho and Its Potential Isostatic Adjustments Chaoyang Zhang Ralph R. B. von Frese C. K. Shum Timothy E. Leftwich Hyung Rae Kim Alexander V. Golynsky 2020-12-01T00:00:00Z https://doi.org/10.1029/2020GC009048 https://doaj.org/article/9498baf2646245a5aaf6b296dc1699cc EN eng Wiley https://doi.org/10.1029/2020GC009048 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2020GC009048 https://doaj.org/article/9498baf2646245a5aaf6b296dc1699cc Geochemistry, Geophysics, Geosystems, Vol 21, Iss 12, Pp n/a-n/a (2020) Antarctic GOCE Moho isostatic adjustments Gamburtsev subglacial mountains Kerguelen mantle hotspot Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.1029/2020GC009048 2023-11-05T01:35:55Z Abstract We investigate the impact of combining Gravity Field and Steady‐state Ocean Circulation Explorer (GOCE) satellite gravity anomaly and Bedmap2 terrain relief data to enhance Antarctic seismic Moho estimates over the satellite's coverage region south of latitude 60°S. The study considers improving the seismic surface wave‐inferred AN1 Moho (An et al., 2015a, https://doi.org/10.1002/2014JB011332) from misfits of the gravitational effects of the terrain and the seismic Moho computed at 250 km altitude. The updates also relate the GOCE gravity anomalies that correlate directly and inversely with the terrain's gravity effects as isostatic anomalies of the uncompensated mantle relief. These terrain‐correlated effects infer potential isostatic adjustments of the Moho that may help constrain the crust's stress field, track the Gamburtsev Subglacial Mountains to the Kerguelen mantle hotspot, and further test the putative Wilkes Land impact basin for its crustal attributes. Analysis of the gravity‐updated seismic AN1 Moho (sAMoho) estimates suggests that most are within the seismic errors of several kilometers or less. However, the gravity‐updated estimates that are deeper than the sAMoho estimates tend to characterize anomalously hot upper mantle where the assumed mantle‐to‐crust density contrast may be too low. These Moho difference estimates discern elevated heat flow for the Maud Rise, Kerguelen Plateau, Pacific‐Antarctic Ridge, and most of western Antarctica extending from the Pacific‐Antarctic Ridge along the Transantarctic Mountains and across the Ross Sea through Marie Byrd Land and the western margin of the Antarctic Peninsula Microplate to the Scotia Ridge. The methodology of this study also is effective in updating any Moho model for improved gravity and terrain data. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Marie Byrd Land Ross Sea Wilkes Land Directory of Open Access Journals: DOAJ Articles Antarctic Antarctic Peninsula Byrd Gamburtsev Subglacial Mountains ENVELOPE(76.000,76.000,-80.500,-80.500) Kerguelen Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) Maud Rise ENVELOPE(3.000,3.000,-66.000,-66.000) Pacific Ross Sea The Antarctic Transantarctic Mountains Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Geochemistry, Geophysics, Geosystems 21 12 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctic GOCE Moho isostatic adjustments Gamburtsev subglacial mountains Kerguelen mantle hotspot Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
spellingShingle |
Antarctic GOCE Moho isostatic adjustments Gamburtsev subglacial mountains Kerguelen mantle hotspot Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 Chaoyang Zhang Ralph R. B. von Frese C. K. Shum Timothy E. Leftwich Hyung Rae Kim Alexander V. Golynsky Satellite Gravity Constraints on the Antarctic Moho and Its Potential Isostatic Adjustments |
topic_facet |
Antarctic GOCE Moho isostatic adjustments Gamburtsev subglacial mountains Kerguelen mantle hotspot Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
description |
Abstract We investigate the impact of combining Gravity Field and Steady‐state Ocean Circulation Explorer (GOCE) satellite gravity anomaly and Bedmap2 terrain relief data to enhance Antarctic seismic Moho estimates over the satellite's coverage region south of latitude 60°S. The study considers improving the seismic surface wave‐inferred AN1 Moho (An et al., 2015a, https://doi.org/10.1002/2014JB011332) from misfits of the gravitational effects of the terrain and the seismic Moho computed at 250 km altitude. The updates also relate the GOCE gravity anomalies that correlate directly and inversely with the terrain's gravity effects as isostatic anomalies of the uncompensated mantle relief. These terrain‐correlated effects infer potential isostatic adjustments of the Moho that may help constrain the crust's stress field, track the Gamburtsev Subglacial Mountains to the Kerguelen mantle hotspot, and further test the putative Wilkes Land impact basin for its crustal attributes. Analysis of the gravity‐updated seismic AN1 Moho (sAMoho) estimates suggests that most are within the seismic errors of several kilometers or less. However, the gravity‐updated estimates that are deeper than the sAMoho estimates tend to characterize anomalously hot upper mantle where the assumed mantle‐to‐crust density contrast may be too low. These Moho difference estimates discern elevated heat flow for the Maud Rise, Kerguelen Plateau, Pacific‐Antarctic Ridge, and most of western Antarctica extending from the Pacific‐Antarctic Ridge along the Transantarctic Mountains and across the Ross Sea through Marie Byrd Land and the western margin of the Antarctic Peninsula Microplate to the Scotia Ridge. The methodology of this study also is effective in updating any Moho model for improved gravity and terrain data. |
format |
Article in Journal/Newspaper |
author |
Chaoyang Zhang Ralph R. B. von Frese C. K. Shum Timothy E. Leftwich Hyung Rae Kim Alexander V. Golynsky |
author_facet |
Chaoyang Zhang Ralph R. B. von Frese C. K. Shum Timothy E. Leftwich Hyung Rae Kim Alexander V. Golynsky |
author_sort |
Chaoyang Zhang |
title |
Satellite Gravity Constraints on the Antarctic Moho and Its Potential Isostatic Adjustments |
title_short |
Satellite Gravity Constraints on the Antarctic Moho and Its Potential Isostatic Adjustments |
title_full |
Satellite Gravity Constraints on the Antarctic Moho and Its Potential Isostatic Adjustments |
title_fullStr |
Satellite Gravity Constraints on the Antarctic Moho and Its Potential Isostatic Adjustments |
title_full_unstemmed |
Satellite Gravity Constraints on the Antarctic Moho and Its Potential Isostatic Adjustments |
title_sort |
satellite gravity constraints on the antarctic moho and its potential isostatic adjustments |
publisher |
Wiley |
publishDate |
2020 |
url |
https://doi.org/10.1029/2020GC009048 https://doaj.org/article/9498baf2646245a5aaf6b296dc1699cc |
long_lat |
ENVELOPE(76.000,76.000,-80.500,-80.500) ENVELOPE(-130.000,-130.000,-78.000,-78.000) ENVELOPE(3.000,3.000,-66.000,-66.000) ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic Antarctic Peninsula Byrd Gamburtsev Subglacial Mountains Kerguelen Marie Byrd Land Maud Rise Pacific Ross Sea The Antarctic Transantarctic Mountains Wilkes Land |
geographic_facet |
Antarctic Antarctic Peninsula Byrd Gamburtsev Subglacial Mountains Kerguelen Marie Byrd Land Maud Rise Pacific Ross Sea The Antarctic Transantarctic Mountains Wilkes Land |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Marie Byrd Land Ross Sea Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Marie Byrd Land Ross Sea Wilkes Land |
op_source |
Geochemistry, Geophysics, Geosystems, Vol 21, Iss 12, Pp n/a-n/a (2020) |
op_relation |
https://doi.org/10.1029/2020GC009048 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2020GC009048 https://doaj.org/article/9498baf2646245a5aaf6b296dc1699cc |
op_doi |
https://doi.org/10.1029/2020GC009048 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
21 |
container_issue |
12 |
_version_ |
1784277760459407360 |